Sybil Attack
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A Sybil attack is a threat on online systems where an attacker creates multiple accounts, nodes, or computers to try to dominate the network.
Against anonymous P2P networks, if more than 51% of the resources are malicious, it can be attacked.
Interesting previous companies, interviews and appearances related to oneself.icon
I remember there was an interesting paper about this attack in USENIX... u7693.icon I'll post it if I remember.